Is it perhaps possible to easily map, for example, the current brightness buttons to, for example, A/V sync? Or am I looking at it too simple?
Rule #1 - Be Patient - Rule #2 - Don't ask when, if you don't contribute - Rule #3 - You have coding skills - LinuxMCE's small brother is available: http://www.agocontrol.com
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Have you installed all codecs needed to play the media files? The restricted ones that is.